By ANTHONY LEWISSpecial to The New York Times ();

August 10, 1971,

, Section , Page 1, Column , words

[ DISPLAYING ABSTRACT ]

BELFAST, Northern Ireland, Tuesday, Aug. 10 -- The Government of Northern Ireland invoked emergency powers of preventive detention yesterday, and the reaction was an explosion of violence that had cost at least a dozen lives by early today.

August 10, 1971

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